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5 SETTINGS
The undervoltage delay setting defines the family of curves shown below.
where: T = operating time
D = undervoltage delay setting (D = 0.00 operates instantaneously)
V = secondary voltage applied to the relay
V
= pickup level
pickup
At 0% of pickup, the operating time equals the
NOTE
GE Multilin
D
T
--------------------------------- -
=
V
⎛
1
------------------
–
⎝
V
pickup
% of voltage pickup
Figure 5–67: INVERSE TIME UNDERVOLTAGE CURVES
UNDERVOLTAGE DELAY
F60 Feeder Protection System
5.5 GROUPED ELEMENTS
⎞
⎠
842788A1.CDR
setting.
(EQ 5.23)
5
5-137
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